Antonio Lewis, 18

Antonio Lewis, 18, has been charged with two counts of first-degree murder and one count of attempted murder in the June 28 deaths of a mom and her son on the South Side. (Chicago Police Dept. photo)

Antonio Lewis, 18, has been charged with two counts of first-degree murder and one count of attempted murder in the June 28 deaths of a mom and her son on the South Side. (Chicago Police Dept. photo) (Chicago Police Dept.)

Antonio Lewis, 18, has been charged with two counts of first-degree murder and one count of attempted murder in the June 28 deaths of a mom and her son on the South Side. (Chicago Police Dept. photo)Chicago Police Dept.